/in/foo.cc: In member function 'void LinkList::Sort()':
/in/foo.cc:70:10: warning: unused variable 'temp' [-Wunused-variable]
    Node* temp;
          ^~~~
/in/foo.cc: In member function 'LinkList LinkList::operator+(LinkList&)':
/in/foo.cc:107:18: warning: unused variable 'bp' [-Wunused-variable]
   Node* ap=head,*bp=pb.head;
                  ^~
/in/foo.cc:109:7: warning: unused variable 'count' [-Wunused-variable]
   int count=0;
       ^~~~~
/in/foo.cc:110:7: warning: unused variable 'flag' [-Wunused-variable]
   int flag=0;
       ^~~~
/in/foo.cc:111:7: warning: unused variable 'i' [-Wunused-variable]
   int i,j;
       ^
/in/foo.cc:111:9: warning: unused variable 'j' [-Wunused-variable]
   int i,j;
         ^